Riots in Detroit, Michigan, have occurred since the city was founded in 1701. This area was settled by various ethnicities following thousands of years of indigenous history. During the colonial period, it was nominally ruled by France and Great Britain before the border was set in the early 19th century and it became part of the United States. The first riot, social unrest related to enabling fugitive slaves to escape to Canada, was recorded in 1833. Other riots were related to business protests, unions, and other issues.